Storage tank capable of exhausting internal air

The utility model relates to a storage tank capable of exhausting internal air. The storage tank comprises a storage tank body, an upper cover main body is arranged at an opening of the tank body, a turning cover body is arranged on the upper cover main body, one side of the turning cover body is hinged to the upper cover main body, and a sealing device is arranged on the bottom face of the turning cover body. An exhaust cavity is formed in the flip cover body, and the exhaust cavity is communicated with the outside and the inner cavity of the tank body up and down; the exhaust cavity is of a wide-end-up structure, a sealing ball is arranged in the exhaust cavity, the sealing ball seals the exhaust cavity when located at the lower end of the exhaust cavity, and an exhaust cavity channel is opened when the sealing ball is upwards separated from the lower end of the exhaust cavity. The flip cover body can be freely opened and closed, the opening of the tank body is sealed through the sealing device when the fli